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12101C474KAT2A Datasheet(PDF) 88 Page - AVX Corporation |
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12101C474KAT2A Datasheet(HTML) 88 Page - AVX Corporation |
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88 / 99 page  87 I. Capacitance (farads) English: C = .224 K A T D Metric: C = .0884 K A T D II. Energy stored in capacitors (Joules, watt - sec) E = 1⁄2 CV2 III. Linear charge of a capacitor (Amperes) I = C dV dt IV. Total Impedance of a capacitor (ohms) Z = R2 S + (XC - XL )2 V. Capacitive Reactance (ohms) xc = 1 2 π fC VI. Inductive Reactance (ohms) xL = 2 π fL VII. Phase Angles: Ideal Capacitors: Current leads voltage 90° Ideal Inductors: Current lags voltage 90° Ideal Resistors: Current in phase with voltage VIII. Dissipation Factor (%) D.F.= tan (loss angle) = E.S.R. = (2 πfC) (E.S.R.) Xc IX. Power Factor (%) P.F. = Sine (loss angle) = Cos f (phase angle) P.F. = (when less than 10%) = DF X. Quality Factor (dimensionless) Q = Cotan (loss angle) = 1 D.F. XI. Equivalent Series Resistance (ohms) E.S.R. = (D.F.) (Xc) = (D.F.) / (2 π fC) XII. Power Loss (watts) Power Loss = (2 π fCV2) (D.F.) XIII. KVA (Kilowatts) KVA = 2 π fCV2 x 10-3 XIV. Temperature Characteristic (ppm/°C) T.C. = Ct – C25 x 106 C25 (Tt – 25) XV. Cap Drift (%) C.D. = C1 – C2 x 100 C 1 XVI. Reliability of Ceramic Capacitors L 0 = V t XT t Y L t ( V o )( To ) XVII. Capacitors in Series (current the same) Any Number: 1 = 1 + 1 --- 1 CT C1 C2 CN C1 C2 Two: CT = C1 + C2 XVIII. Capacitors in Parallel (voltage the same) CT = C1 + C2 --- + CN XIX. Aging Rate A.R. = % D C/decade of time XX. Decibels db = 20 log V1 V2 Pico X 10-12 Nano X 10-9 Micro X 10-6 Milli X 10-3 Deci X 10-1 Deca X 10+1 Kilo X 10+3 Mega X 10+6 Giga X 10+9 Tera X 10+12 K = Dielectric Constant f = frequency L t = Test life A = Area L = Inductance V t = Test voltage T D = Dielectric thickness = Loss angle V o = Operating voltage V = Voltage f = Phase angle T t = Test temperature t = time X & Y = exponent effect of voltage and temp. T o = Operating temperature Rs = Series Resistance L o = Operating life METRIC PREFIXES SYMBOLS Basic Capacitor Formulas |
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